Aktive Projekte

Modeling and numerical treatment of the active response of arteries

R. R. Gilbert

The underlying project is part of the GIF-project "Vasoreactive response of the skeletonized distal internal thoracic artery and bifurcation branches: Application for CABG", which is a collaborative research project with the TU München and the Ben-Gurion University of the Negev. Based on experimental results at arteries a constitutive model has been developed taking into account both the passive and the active response of various chemicals and the highly anisotropic behavior of arteries. The resulting model is provided for numerical computations treating the complex geometry of arteries.

Combining contact algorithm schemes with time-integration schemes

M. Grafenhorst

Boundary-value problems within practical problems are very often connected to contact conditions. Within this project, both 2D and 3D-mortar element contact schemes are combined with time-adaptive schemes using high-order diagonally implicit Runge-Kutta methods and high-order time-discretization schemes for dynamical problems to obtain more efficient implicit finite element computations.

Modeling and Simulation of Winding Processes of Composite Materials

Chris Leistner

In this project the winding process of composites is modeled under the aspect of a continuous process. The challenging aspects are seen in the curing behavior, the increasing region during the process due to mass transport over the system boundary, spatially distributed anisotropy and thermo-mechanical coupling. Apart from the constitutive modeling aspects, the numerical treatment must be enforced.

Experiments, modeling and computation of zinc die-cast material

M. Martinez-Page

Frequently applied parts in industry are made of zinc die-cast. Since classical constitutive models cannot predict the thermo-mechanical structural behavior, mechanical experiment under varying thermal conditions are carried out as a basis for constitutive modeling. The model is implemented into a finite element program. Special emphasis is taken for thickness-dependence and ageing properties.

Coupling of multi-physical processes in the simulation of gas wells

J. Mohan

Energy storage is a topic of great interest in recent times owing to the fluctuating energy production mainly from wind and solar energy power plants. Another key aspect is the sustainable reduction of greenhouse gases produced from the non-renewable energy sources. There are different methods like Hydrogen storage, Power-to-Gas method, CO2 storage etc. by which energy could be stored in underground caverns and later utilized as per the energy demand. All these methods require the use of gas wells and their technical integrity has to be assured for economic viability and longevity. Simulation of these gas wells comprising of the gas well tubes, packers, cement, geological formations and the injected gas prove to be critical in determining their performance. The goal of the project is to develop an efficient coupling tool for different solvers used in the simulation of such multi-physical multiphase gas well models. The individual fields will be solved respectively with the help of in-house FEM code TasaFEM (thermo-mechanics), open sources codes like OpenFoam (fluid flow) and DuMux (porous medium flow) in a coupled manner. It is further envisaged to compare the results of the simulations to the experiments to be conducted at the Drilling-Simulator at Celle, Lower-Saxony, Germany and thereby have a comprehensive understanding with the help of theory, simulation and experiments of the gas well operation.

Experiments, modelling and computation of sandwich-polymer sheets

R. R. Gilbert

Modern structural elements are made of composite materials. In this project, the polymer kernel (PP/PE) in a sandwich-like structure is experimentally investigated and a constitutive model is developed. A particular focus lies on the investigation of thermo-mechanical coupling phenomena of all constituents. Numerical validation examples proof the applicability of the concept.

Modeling and simulation of fiber positioning in composite structures under electro-magnetic agencies

A. Kheiri

Modern structural elements are made of composite materials. In this project, the polymer kernel (PP/PE) in a sandwich-like structure is experimentally investigated and a constitutive model is developed. A particular focus lies on the investigation of thermo-mechanical coupling phenomena of all constituents. Numerical validation examples proof the applicability of the concept.